EP0154335A2 - Magneto d.c. motor - Google Patents
Magneto d.c. motor Download PDFInfo
- Publication number
- EP0154335A2 EP0154335A2 EP85102521A EP85102521A EP0154335A2 EP 0154335 A2 EP0154335 A2 EP 0154335A2 EP 85102521 A EP85102521 A EP 85102521A EP 85102521 A EP85102521 A EP 85102521A EP 0154335 A2 EP0154335 A2 EP 0154335A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- yoke
- retainer
- magnets
- magneto
- permanent magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
Definitions
- This invention relates to a magneto D.C. motor, and more particularly, to a stator for a magneto D.C. motor in which magnets are fixed to a yoke firmly without using an adhesive.
- a magneto dynamo in which magnets are fixed to a yoke by using an elastic material for the inner periphery of the magnets has been hitherto proposed.
- magnets are supported by arms provided on retainers, and there is also a problem similar to that of the magneto dynamo disclosed in Japanese Laid-Open No. 16561/1982.
- a magneto D.C. motor which comprises: a stator consisting of a plurality of permanent magnets disposed on the inner periphery of a yoke; and retainers made of an elastic material, each of the retainers having two axially extending supporting parts and being secured to the yoke in the gap between the permanent magnets; and the two supporting parts of the retainer which extend in the central axial direction of the D.C. motor securing the permanent magnets to the yoke by pressing and clamping the magnets in close contact with the magnets from three directions, namely from each side surface of the magnets and each end surface of the magnets adjacent to each of the side surfaces, as will be clear from the explanation which will be made later.
- the present invention can easily accomplish the expected object, because according to the invention, permanent magnets are, in the way described above, pressed and clamped from three directions by elastic members which are secured to a yoke.
- a stator 1 consists of a cylindrical yoke 2 and a plurality of permanent magnets 4 disposed on the inner periphery thereof.
- a rotor 10 rotating around the central axis O of the stator 1 by excitation is provided inside the stator 1.
- These plurality of permanent magnets 4 are disposed on the inner periphery of the yoke 2 with gaps 9 between two adjacent magnets.
- the permanent magnets are secured to the yoke 2, as is obvious from Figs. 1, 2, by fixing one surface 11 of a'retainer 3 made 'of an elastic material and having a U-like configuration in cross section, on the yoke 2.
- the retainer 3 On the retainer 3 are formed supporting parts 3a, 3b extending in a direction of the central axis O, thereby to clamp the permanent magnets 4 for the purpose of elastically retaining and fixing the permanent magnets 4 by the retainer 3 made of the elastic material.
- the supporting parts 3a, 3b consist of two surfaces 12, 13 extending in the direction of the central axis of the D.C. motor along the side surfaces 71, 72 of the magnets 4 opposite to each other across the gap 9 and end portions 32 which are made of the elastic material and are provided along the end surfaces 81, 82 of the permanent magnets 4 extending in a direction of the central axis of the D.C. motor. These two surfaces 12, 13 and the end portions 32 elastically retain the permanent magnets 4.
- Both ends of the end portions 32 of the supporting parts 3a, 3b are elastic portions 32 having a substantially S-shaped configuration, which clamp the end surfaces 81, 82 of the magnets approximate to the side surfaces 71, 72 of the permanent magnets opposite to each other across the gap 9 on the inner periphery of the yoke 2.
- the supporting parts 3a, 3b secure the permanent magnets 4 to the yoke 2 by pressing and clamping the magnets while being in contact with them from three directions, namely from each longitudinal edge 71, 72 of the permanent magnets 4 and from the end surfaces 82, 82 of the magnets adjacent to the longitudinal edges 71, 72.
- the retainer 3 having bores 33 on the inner periphery of the cylindrical yoke 2 is secured to the yoke 2 by charging a yoke member_into the plurality of the bores 33 of the 21 or 22 retainer 3 from the outer periphery of the yoke 2 by pressing presses 7 and by plastic bonding after the retainer is set on a mold 61.
- the retainer 3 secured to the yoke 2 by plastic bonding in this way heightens the retaining strength of the magnet all the more.
- a retainer 3 made of the elastic material and having a U-like configuration in cross section is first secured to the yoke 2.
- the supporting parts 3a, 3b are extended in the axial direction, i.e. in a direction lateral to the surface of the stator 1 in Fig. 3, or such as to retain the permanent magnet 4 and the auxiliary pole 5, respectively, from the right and left in Figs. 4, 5.
- both ends of the supporting part 3a for retaining the permanent magnet 4 are elastic portions 32 having a substantially S-like configuration, which clamp the magnets 4.
- One end of the supporting part 3b is an elastic portion 34 having a substantially S-like configuration, and at one position of the other end an engaging pawl 31 is formed such as to clamp the auxiliary pole between the elastic portion 34 and the pawl 31.
- the permanent magnet 4 is inserted into the supporting part 3a from the peripheral direction so as to be retained. That is, the permanent magnet 4 is inserted into a part 3c between the supporting part 3a and the supporting part 3b shown in Fig. 3, namely the part 3c into which the magnet can be inserted without being interrupted by the supporting parts 3a and 3h, and next moved in the peripheral direction as indicated by the arrow 3d in order to insert the permanent magnet 4 into the supporting part 3a such as to be clamped by both elastic portions 32 of the supporting part 3a. Subsequently, the auxiliary pole 5 made of soft-iron is inserted in the direction indicated by the arrow 3e in Fig. 4, namely in a direction from the back surface to the front surface of the stator 10 in Fig.
- the permanent magnet 4 is formed such that a side surface extending in the axial direction, namely an-axial side surface 4a, is a tangential plane radiant from the center O of the yoke 2.
- the surface 4a is made to be a surface approximately agreeing with the line from the center O.
- the side surface 5a of the auxiliary pole 5 is also made to be a radial tangential plane. Therefore, both surfaces 4a, 5a are in contact with each other.
- the retainer 3 is formed in a substantially U-shaped configuration in cross section, the permanent magnet 4 and the auxiliary pole 5 can be fixed by pressing the retainer 6 between the permanent magnet 4 and the auxiliary pole 5 while deflecting the U-like configuration in cross section, and by pressing the permanent magnet 4 and the auxiliary pole 5 with this tension.
- the tension of the retainer 3 acts effectively such as to press the permanent magnet 4 to the inner periphery of the yoke 2.
- this retainer 3 is made such that the permanent magnet 4 is • inserted from the periphery direction and the auxiliary pole 5 from the axial direction, so as to clamp the permanent magnet 4 between both elastic portions 32 and the auxiliary pole 5 between the pawl 31 and the elastic portion 34. This assembly operation is very easy and after the assembly it is securely retained due to the elastic force.
- the retainer 3 in the embodiment is made of an elastic steel sheet.
- the metal leaf above described can be made of the elastic sheet.
- An elastic material other than metal can also be used if it has a similar elasticity.
- the axial length Lm of the permanent magnet 4 and the length Ls of the clamping portion 3 shown in Figs. 4,.5 are set such as to satisfy the following condition: Lm > Ls, and such as to clamp the permanent magnet 4, in the combination of both, with an adequate pressure.
- an adequate clamping pressure is set to the auxiliary pole '5.
- the embodiment is efficient in securely retaining the permanent magnet 4 and auxiliary pole 5 on the yoke 2 in a simple method. Furthermore, by fixing the retainer 3 on the yoke 2 mechanical out-of-roundness of the yoke is less variable and the inner diameter of the permanent magnet can be maintained with higher accuracy.
- the gap between the stator 1 and an armature should be minute and uniform from the viewpoint of performance, but when the out-of-roundness of the stator 1 increases, some part of the gap becomes large, resulting in reduced performance.
- the magnet and the yoke expand separately, the yoke on the outer side expands at the time of heating for the purpose of bonding, and if they are bonded under this state, the curvature radius of the bonding part is large while that of the other part is small, i.e. the out-of-roundness is increased.
- This embodiment is free from such risk.
- this invention in which a retainer made of an elastic material retains a permanent magnet and an auxiliary pole retains by pressing them to the inner periphery of a yoke has the following advantages: the assembly process is easy; the structure is simple; the permanent magnet is not broken by thermal shock or impact; and high reliability is obtained by efficient retaining force.
- an auxiliary pole 5 is fixed on the inner periphery of a yoke 2.
- the auxiliary pole 5 is fixed by welding or the like or the auxiliary pole 5 and the yoke 2 are united into one body by cold forging.
- a permanent magnet 4 is secured to said yoke 2 and said auxiliary pole 5 by a retainer 6 which is made of an elastic member. That is, the permanent , magnet 4 is adjacently in contact with the auxiliary pole 5 with the retainer 6 disposed between them and the permanent magnet 4 is fixed by pressure due to the elastic force of the retainer 6.
- the retainer 6 made of the elastic member is inserted into the gap between the auxiliary pole 5 and the permanent magnet 4 from the axial direction, and the fixing is completed when the movement of the permanent magnet 4 in the axial direction is stopped.
- the axial side surface 4a of the permanent magnet 4 is made to be a radial tangential plane and the side surface 5a of the auxiliary pole 5 is also made to be a radial tangential plane such that both surfaces may be in contact with each other.
- the permanent magnet 4 and the auxiliary pole 5 can be fixed by pressing the retainer 6 which has been made in a U-like configuration in cross section between the permanent magent 4 and the auxiliary pole 5 while deflecting the U-like configuration in cross section, and by pressing the permanent magnet 4 to the auxiliary pole 5 with this tension.
- the tension of the retainer 6 acts effectively such as to press the permanent magnet 4 to the inner periphery of the yoke 2, thus a secure fixing being accomplished.
- Tapers 63 are attached to the fore end portion of the retainer 6 such as to make its insertion easy. This facilitates insertion at the time of assembly. Further, in order to prevent axial movement of the permanent magnet 4, a retaining protrusion 61a is provided on the side surface of the fore end portion of the insertion side, and a compression elastic portion 62a having a substantially S-shaped configuration is provided on the other end portion. The protrusion 61a is formed by cutting and raising a pawl as is shown in the drawing. As a result, the permanent magnet 4 is clamped between the compression elastic portion 62a and the protrusion 61a.
- the permanent magnet 4 is clamped due to the elastic force from the compression elastic portion 62a on one end portion and the protrusion 61a for retaining the compression on the other end.
- Similar compression elastic portion 62b and protrusion 61b are formed on the side for clamping the auxiliary pole 5 .
- the auxiliary pole 5 which is fixed on the yoke 2 is first clamped by the elastic force of the compression elastic portion 62b and the protrusion 61b such as to prevent the movement of the retainer 6, and the permanent magnet 4 is next clamped similarly, thus fixing which prevents the movement of the permanent magnet 4 being accomplished.
- a notch 41 is made on a part of the surface of the permanent magnet 4 which contacts with the auxiliary pole 5.
- the axial length Lm of the permanent magnet 4 and the length Ls of the clamping portion 3 are set such as to satisfy the following condition: Lm > Ls, and such as to clamp the permanent magnet 4, in the combination of both, with an adequate pressure.
- a similar dimension is set to the auxiliary pole 5 such as to clamp the auxiliary pole 5 by an adequate clamping pressure.
- Fig. 9 shows a third embodiment of the invention.
- An elastic steel belt 8 slightly longer than the entire length of the inner periphery is inserted into the inner periphery of magnetic poles, and disposed in the gaps between the magnetic poles by deflecting and pressing it from the inner periphery side and butting both ends of the belt such as to prevent the movement of the magnetic poles.
- the reinforcing ribs 34 are provided so as to prevent such a loose retainer 3 from projecting to the inner surface and to heighten the accuracy of the inner diameter.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
- This invention relates to a magneto D.C. motor, and more particularly, to a stator for a magneto D.C. motor in which magnets are fixed to a yoke firmly without using an adhesive.
- A magneto dynamo in which magnets are fixed to a yoke by using an elastic material for the inner periphery of the magnets has been hitherto proposed.
- As this kind of magneto dynamo, there exists, for example, "ROTOR FOR MAGNETO DYNAMO" disclosed in Japanese Laid-Open No. 16561/1982 which was laid open in Japan on January 28, 1982..
- In this magneto dynamo disclosed in Japanese Laid-Open No. 16561/1982, as is obvious from the claims, since magnets are secured to a yoke simply by pressing the magnets from the inner periphery to the outside by means of retainers, the securing strength of the magnets with respect to the yoke is not necessarily sufficient and there is the problem of resistance to vibration.
- Further, a magneto D.C. motor in which magnets are secured to a yoke by inserting an elastic member between magnets has been known.
- As this kind of magneto dynamo, there exists, for example, "DYNAMO" which was laid open in Japan on September 6, 1982.
- In the magneto D.C. motor disclosed in Japanese Laid-Open No. 113707/1975, as is obvious from the claims, magnets are supported by arms provided on retainers, and there is also a problem similar to that of the magneto dynamo disclosed in Japanese Laid-Open No. 16561/1982.
- Accordingly it is an object of the invention to provide a magneto D.C. motor which is efficient in retaining strength of a yoke and magnets and which can resist vibration sufficiently from the viewpoint of strength.
- To this end, a magneto D.C. motor is invented which comprises: a stator consisting of a plurality of permanent magnets disposed on the inner periphery of a yoke; and retainers made of an elastic material, each of the retainers having two axially extending supporting parts and being secured to the yoke in the gap between the permanent magnets; and the two supporting parts of the retainer which extend in the central axial direction of the D.C. motor securing the permanent magnets to the yoke by pressing and clamping the magnets in close contact with the magnets from three directions, namely from each side surface of the magnets and each end surface of the magnets adjacent to each of the side surfaces, as will be clear from the explanation which will be made later.
- The present invention can easily accomplish the expected object, because according to the invention, permanent magnets are, in the way described above, pressed and clamped from three directions by elastic members which are secured to a yoke.
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- Fig. 1 is a front view of a stator for a magneto D.C. motor according to the invention the magnetic poles of which are composed of only permanent magnets;
- Fig. 2 shows in detail one of the retainers shown in Fig. 1;
- Fig. 3 is a front view of a stator for another embodiment of a magneto D.C. motor according to the invention the magnetic poles of which are composed of permanent magnets and auxiliary poles;
- Fig. 4 explains in detail one of the retainers shown in Fig. 3;
- Fig. 5 is a perspective view of the retainer shown in Fig. 4; ,
- Fig. 6 is a front view of a stator for a second embodiment of a magneto D.C. motor the magnetic pole of which is composed of permanent magnets and auxiliary poles;
- Fig. 7 explains in detail one of the retainers shown in Fig. 6;
- Fig. 8 is a perspective view of the retainer shown in Fig. 7;
- Fig. 9 is a front view of a stator for a third embodiment of a magneto D.C. motor according to the invention the magnetic poles of which are composed of permanent magnets and auxiliary poles;
- Fig. i0 explains in detail one of the retainers shown in Fig. 9;
- Fig. 11 is a perspective view of the retainer shown in Fig. 10; and
- Fig. 12 explains a method of securing a retainer to a yoke in the invention.
- Referring to Fig. 1, a
stator 1 consists of acylindrical yoke 2 and a plurality ofpermanent magnets 4 disposed on the inner periphery thereof. Arotor 10 rotating around the central axis O of thestator 1 by excitation is provided inside thestator 1. - These plurality of
permanent magnets 4 are disposed on the inner periphery of theyoke 2 withgaps 9 between two adjacent magnets. - The permanent magnets are secured to the
yoke 2, as is obvious from Figs. 1, 2, by fixing onesurface 11 of a'retainer 3 made 'of an elastic material and having a U-like configuration in cross section, on theyoke 2. - On the
retainer 3 are formed supportingparts permanent magnets 4 for the purpose of elastically retaining and fixing thepermanent magnets 4 by theretainer 3 made of the elastic material. - The supporting
parts surfaces side surfaces magnets 4 opposite to each other across thegap 9 andend portions 32 which are made of the elastic material and are provided along theend surfaces permanent magnets 4 extending in a direction of the central axis of the D.C. motor. These twosurfaces end portions 32 elastically retain thepermanent magnets 4. - Both ends of the
end portions 32 of the supportingparts elastic portions 32 having a substantially S-shaped configuration, which clamp theend surfaces side surfaces gap 9 on the inner periphery of theyoke 2. - In this way, according to the present invention, the supporting
parts permanent magnets 4 to theyoke 2 by pressing and clamping the magnets while being in contact with them from three directions, namely from eachlongitudinal edge permanent magnets 4 and from theend surfaces longitudinal edges - Referring to Fig. 12, the
retainer 3 havingbores 33 on the inner periphery of thecylindrical yoke 2 is secured to theyoke 2 by charging a yoke member_into the plurality of thebores 33 of the 21 or 22retainer 3 from the outer periphery of theyoke 2 by pressingpresses 7 and by plastic bonding after the retainer is set on amold 61. Theretainer 3 secured to theyoke 2 by plastic bonding in this way heightens the retaining strength of the magnet all the more. - A method of fixing a
permanent magnet 4 and anauxiliary pole 5 on ayoke 2 will be described with reference to Figs 3, 4 and 5, in the following. - A
retainer 3 made of the elastic material and having a U-like configuration in cross section is first secured to theyoke 2. On theretainer 3, supportingparts part 3a for clamping thepermanent magnet 4 and the other supportingpart 3b for clamping theauxiliary pole 5. All of these are elastically retained and fixed by theretainer 3 made of the elastic material in the way shown in Figs. 1, 2. - The supporting
parts stator 1 in Fig. 3, or such as to retain thepermanent magnet 4 and theauxiliary pole 5, respectively, from the right and left in Figs. 4, 5. In the embodiment, both ends of the supportingpart 3a for retaining thepermanent magnet 4 areelastic portions 32 having a substantially S-like configuration, which clamp themagnets 4. One end of the supportingpart 3b is anelastic portion 34 having a substantially S-like configuration, and at one position of the other end anengaging pawl 31 is formed such as to clamp the auxiliary pole between theelastic portion 34 and thepawl 31. - In assembly, the
permanent magnet 4 is inserted into the supportingpart 3a from the peripheral direction so as to be retained. That is, thepermanent magnet 4 is inserted into apart 3c between the supportingpart 3a and the supportingpart 3b shown in Fig. 3, namely thepart 3c into which the magnet can be inserted without being interrupted by the supportingparts 3a and 3h, and next moved in the peripheral direction as indicated by thearrow 3d in order to insert thepermanent magnet 4 into the supportingpart 3a such as to be clamped by bothelastic portions 32 of the supportingpart 3a. Subsequently, theauxiliary pole 5 made of soft-iron is inserted in the direction indicated by thearrow 3e in Fig. 4, namely in a direction from the back surface to the front surface of thestator 10 in Fig. 3. In this way theauxiliary pole 5 is inserted while pushing thepawl 31 such as to flatten the pawl. When therear end 51 of theauxiliary pole 5 has passed thepawl 31, thepawl 31 rises to engage therear end 51 as shown in Fig. 4. As a result, theauxiliary pole 5 is clamped so as to be retained between theelastic portion 34 and thepawl 31. - The
permanent magnet 4 is formed such that a side surface extending in the axial direction, namely an-axial side surface 4a, is a tangential plane radiant from the center O of theyoke 2. In other words, thesurface 4a is made to be a surface approximately agreeing with the line from the center O. Theside surface 5a of theauxiliary pole 5 is also made to be a radial tangential plane. Therefore, bothsurfaces retainer 3 is formed in a substantially U-shaped configuration in cross section, thepermanent magnet 4 and theauxiliary pole 5 can be fixed by pressing theretainer 6 between thepermanent magnet 4 and theauxiliary pole 5 while deflecting the U-like configuration in cross section, and by pressing thepermanent magnet 4 and theauxiliary pole 5 with this tension. - As is obvious from the above description, in the embodiment, by providing the
surfaces auxiliary pole 5 and thepermanent magnet 5, the tension of theretainer 3 acts effectively such as to press thepermanent magnet 4 to the inner periphery of theyoke 2. - In addition, as described above, this
retainer 3 is made such that thepermanent magnet 4 is • inserted from the periphery direction and theauxiliary pole 5 from the axial direction, so as to clamp thepermanent magnet 4 between bothelastic portions 32 and theauxiliary pole 5 between thepawl 31 and theelastic portion 34. This assembly operation is very easy and after the assembly it is securely retained due to the elastic force. - It is also possible to insert a rolled-up belt-like metal leaf into a gap between the
permanent magnet 4 and theauxiliary pole 5 while keeping the metal leaf in close contact with the inner periphery of theauxiliary pole 5 such as to prevent each part from springing out to the inside. - The
retainer 3 in the embodiment is made of an elastic steel sheet. The metal leaf above described can be made of the elastic sheet. An elastic material other than metal can also be used if it has a similar elasticity. - In the embodiment, the axial length Lm of the
permanent magnet 4 and the length Ls of the clampingportion 3 shown in Figs. 4,.5 are set such as to satisfy the following condition:
Lm > Ls, and such as to clamp thepermanent magnet 4, in the combination of both, with an adequate pressure. Similarly, an adequate clamping pressure is set to the auxiliary pole '5. - In this way, the embodiment is efficient in securely retaining the
permanent magnet 4 andauxiliary pole 5 on theyoke 2 in a simple method. Furthermore, by fixing theretainer 3 on theyoke 2 mechanical out-of-roundness of the yoke is less variable and the inner diameter of the permanent magnet can be maintained with higher accuracy. The gap between thestator 1 and an armature should be minute and uniform from the viewpoint of performance, but when the out-of-roundness of thestator 1 increases, some part of the gap becomes large, resulting in reduced performance. For example, according to the conventional fixing by bonding, since the magnet and the yoke expand separately, the yoke on the outer side expands at the time of heating for the purpose of bonding, and if they are bonded under this state, the curvature radius of the bonding part is large while that of the other part is small, i.e. the out-of-roundness is increased. This embodiment, however, is free from such risk. - In experiments of dropping a one-pound steel ball, the conventional structure in which the magnet is fixed on the yoke by bonding produced a crack when it was dropped from a height of 30 - 40 cm, whereas this embodiment did not produce a crack until it was dropped from a height of 70 cm. Some samples did not produce a crack until the steel ball was dropped from a height of 90 cm.
- As described above, this invention in which a retainer made of an elastic material retains a permanent magnet and an auxiliary pole retains by pressing them to the inner periphery of a yoke has the following advantages: the assembly process is easy; the structure is simple; the permanent magnet is not broken by thermal shock or impact; and high reliability is obtained by efficient retaining force.
- Next, a second embodiment of the invention will be described with reference to Figs. 6 to 8.
- In this embodiment, an
auxiliary pole 5 is fixed on the inner periphery of ayoke 2. For example,theauxiliary pole 5 is fixed by welding or the like or theauxiliary pole 5 and theyoke 2 are united into one body by cold forging. Apermanent magnet 4 is secured to saidyoke 2 and saidauxiliary pole 5 by aretainer 6 which is made of an elastic member. That is, the permanent ,magnet 4 is adjacently in contact with theauxiliary pole 5 with theretainer 6 disposed between them and thepermanent magnet 4 is fixed by pressure due to the elastic force of theretainer 6. - In assembly, with the axial side surface of the
permanent magnet 4 in contact with theauxiliary pole 5, namely with thepermanent magnet 4 at a predetermined position, theretainer 6 made of the elastic member is inserted into the gap between theauxiliary pole 5 and thepermanent magnet 4 from the axial direction, and the fixing is completed when the movement of thepermanent magnet 4 in the axial direction is stopped. - In this embodiment as well as the above embodiment, the
axial side surface 4a of thepermanent magnet 4 is made to be a radial tangential plane and theside surface 5a of theauxiliary pole 5 is also made to be a radial tangential plane such that both surfaces may be in contact with each other. Thepermanent magnet 4 and theauxiliary pole 5 can be fixed by pressing theretainer 6 which has been made in a U-like configuration in cross section between thepermanent magent 4 and theauxiliary pole 5 while deflecting the U-like configuration in cross section, and by pressing thepermanent magnet 4 to theauxiliary pole 5 with this tension. As is obvious from the above description, in the embodiment, by providing the surfaces which are in contact with the radial line directing toward the center of the axis, on theauxiliary pole 5 and thepermanent magnet 4, the tension of theretainer 6 acts effectively such as to press thepermanent magnet 4 to the inner periphery of theyoke 2, thus a secure fixing being accomplished. -
Tapers 63 are attached to the fore end portion of theretainer 6 such as to make its insertion easy. This facilitates insertion at the time of assembly. Further, in order to prevent axial movement of thepermanent magnet 4, a retainingprotrusion 61a is provided on the side surface of the fore end portion of the insertion side, and a compressionelastic portion 62a having a substantially S-shaped configuration is provided on the other end portion. Theprotrusion 61a is formed by cutting and raising a pawl as is shown in the drawing. As a result, thepermanent magnet 4 is clamped between the compressionelastic portion 62a and theprotrusion 61a. In this way, thepermanent magnet 4 is clamped due to the elastic force from the compressionelastic portion 62a on one end portion and theprotrusion 61a for retaining the compression on the other end. On the side for clamping theauxiliary pole 5 also, similar compressionelastic portion 62b andprotrusion 61b are formed. In this structure, theauxiliary pole 5 which is fixed on theyoke 2 is first clamped by the elastic force of the compressionelastic portion 62b and theprotrusion 61b such as to prevent the movement of theretainer 6, and thepermanent magnet 4 is next clamped similarly, thus fixing which prevents the movement of thepermanent magnet 4 being accomplished. - In addition, in this embodiment, in order to make insertion easy, a
notch 41 is made on a part of the surface of thepermanent magnet 4 which contacts with theauxiliary pole 5. - Unlike the embodiments above described, according to this embodiment, it is not necessary to dispose a protruded molded product as is indicated by the
referential numeral 21 in Fig. 3. Therefore it does not involve the risk of changing the degree of round theyoke 2 when such protruded molded product is formed, which secures the inner diameter of thepermanent magnet 4 with high accuracy. - In this embodiment also, the axial length Lm of the
permanent magnet 4 and the length Ls of the clampingportion 3 are set such as to satisfy the following condition:
Lm > Ls, and such as to clamp thepermanent magnet 4, in the combination of both, with an adequate pressure. A similar dimension is set to theauxiliary pole 5 such as to clamp theauxiliary pole 5 by an adequate clamping pressure. - Fig. 9 shows a third embodiment of the invention. An
elastic steel belt 8 slightly longer than the entire length of the inner periphery is inserted into the inner periphery of magnetic poles, and disposed in the gaps between the magnetic poles by deflecting and pressing it from the inner periphery side and butting both ends of the belt such as to prevent the movement of the magnetic poles. - In this structure, on the axial side surfaces of a
permanent magnet 4 and anauxiliary pole 5, are providedtangential planes 41 radial from the center such that these surfaces may contact with each other. Further, due to the tension caused by pressing and disposing aretainer 3 which has been made in a U-like configuration in cross section between thepermanent magnet 4 and theauxiliary pole 5 while deflecting the U-like configuration in cross section, thepermanent magnet 4 and theauxiliary pole 5 are secured to ayoke 2. In'other words, the tension of theretainer 3 is made effective in pressing the magnetic poles in the outer peripheral direction by providing the radial tangential planes. In addition, a plurality of reinforcingribs 34 are provided on theretainer 3. When the width of theretainer 3 is narrow due to unequal dimension of insertion, the bendingparts 42 become large curves R and theretainer 3 works loose. - The reinforcing
ribs 34 are provided so as to prevent such aloose retainer 3 from projecting to the inner surface and to heighten the accuracy of the inner diameter.
Claims (10)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59041970A JPS60187249A (en) | 1984-03-07 | 1984-03-07 | Stator for magnet type dc machine |
JP41970/84 | 1984-03-07 | ||
JP5831184A JPS60204235A (en) | 1984-03-28 | 1984-03-28 | Stator of small-sized rotary electric machine |
JP58311/84 | 1984-03-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0154335A2 true EP0154335A2 (en) | 1985-09-11 |
EP0154335A3 EP0154335A3 (en) | 1986-07-16 |
EP0154335B1 EP0154335B1 (en) | 1989-06-07 |
Family
ID=26381622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85102521A Expired EP0154335B1 (en) | 1984-03-07 | 1985-03-06 | Magneto d.c. motor |
Country Status (4)
Country | Link |
---|---|
US (1) | US4745319A (en) |
EP (1) | EP0154335B1 (en) |
CA (1) | CA1247686A (en) |
DE (1) | DE3570962D1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0188231A2 (en) * | 1985-01-14 | 1986-07-23 | Hitachi, Ltd. | Permanent magnet type DC motor having improved magnet fixture structure |
GB2209880A (en) * | 1987-09-16 | 1989-05-24 | Johnson Electric Ind Mfg | Magnet retainer in an electric motor |
FR2676871A1 (en) * | 1991-05-24 | 1992-11-27 | Mitsuba Electric Mfg Co | STRUCTURE FOR FIXING PERMANENT MAGNETS IN AN ENGINE. |
EP0544929A1 (en) * | 1991-11-29 | 1993-06-09 | Siemens Aktiengesellschaft | Arrangement for fixing magnet shells into a motor casing |
FR2707049A1 (en) * | 1993-06-21 | 1994-12-30 | Valeo Systemes Dessuyage | Electric machine with ferrite, electric motor thus constituted and vehicle power steering system |
FR2723490A1 (en) * | 1994-08-04 | 1996-02-09 | Valeo Systemes Dessuyage | Electric motor assembly including permanent magnet assembly |
WO1996038900A1 (en) * | 1995-06-02 | 1996-12-05 | Ugimag S.A. | Device for attaching magnets to electric motor stator or rotor yokes |
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DE102006022612A1 (en) * | 2006-05-15 | 2007-11-22 | Schürholz GmbH & Co. KG Stanztechnik | Housing element e.g. rotor pot, for e.g. electronic commutating motor, has spring element with radial guide placed at end, where guide protrudes from base to interference body and engages in recess of interference body in suitable manner |
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US4841190A (en) * | 1987-05-01 | 1989-06-20 | Minebea Co., Ltd. | Resin-filled permanent-magnet stepping motor |
JPH083152Y2 (en) * | 1988-03-25 | 1996-01-29 | カルソニック株式会社 | Motor magnet holding structure |
US4873461A (en) * | 1988-05-13 | 1989-10-10 | Stryker Corporation | Electric motor sterilizable surgical power tool |
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JP3051230B2 (en) * | 1991-11-28 | 2000-06-12 | マブチモーター株式会社 | Manufacturing method of stator for small motor |
US5202599A (en) * | 1992-05-08 | 1993-04-13 | Kao Wen Chung | Electric motor |
US5874794A (en) * | 1995-07-28 | 1999-02-23 | Ryobi North America, Inc. | Method for securing magnets to a permanent magnet motor shell and a motor made therefrom |
KR20020042118A (en) * | 2000-11-30 | 2002-06-05 | 에릭 발리베 | A holder for magnet fixing of starter motor |
DE10108192A1 (en) * | 2001-02-21 | 2002-08-29 | Bosch Gmbh Robert | workpiece |
US6603232B2 (en) * | 2001-11-02 | 2003-08-05 | Electric Boat Corporation | Permanent magnet retaining arrangement for high speed rotors |
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ITBO20110587A1 (en) * | 2011-10-17 | 2013-04-18 | Spal Automotive Srl | ROTOR FOR ELECTRIC MACHINE AND ITS ASSEMBLY PROCEDURE |
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- 1985-03-06 EP EP85102521A patent/EP0154335B1/en not_active Expired
- 1985-03-06 DE DE8585102521T patent/DE3570962D1/en not_active Expired
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0188231A2 (en) * | 1985-01-14 | 1986-07-23 | Hitachi, Ltd. | Permanent magnet type DC motor having improved magnet fixture structure |
EP0188231A3 (en) * | 1985-01-14 | 1987-02-25 | Hitachi, Ltd. | Permanent magnet type dc motor having improved magnet fixture structure |
US4707630A (en) * | 1985-01-14 | 1987-11-17 | Hitachi, Ltd. | Magnetic cover member for magnetic poles of DC motor |
GB2209880A (en) * | 1987-09-16 | 1989-05-24 | Johnson Electric Ind Mfg | Magnet retainer in an electric motor |
GB2209880B (en) * | 1987-09-16 | 1991-11-06 | Johnson Electric Ind Mfg | Magnet retainer in an electric motor |
FR2676871A1 (en) * | 1991-05-24 | 1992-11-27 | Mitsuba Electric Mfg Co | STRUCTURE FOR FIXING PERMANENT MAGNETS IN AN ENGINE. |
EP0544929A1 (en) * | 1991-11-29 | 1993-06-09 | Siemens Aktiengesellschaft | Arrangement for fixing magnet shells into a motor casing |
US5276375A (en) * | 1991-11-29 | 1994-01-04 | Siemens Aktiengesellschaft | Apparatus for fixation of magnetic shells in a motor housing |
FR2707049A1 (en) * | 1993-06-21 | 1994-12-30 | Valeo Systemes Dessuyage | Electric machine with ferrite, electric motor thus constituted and vehicle power steering system |
FR2723490A1 (en) * | 1994-08-04 | 1996-02-09 | Valeo Systemes Dessuyage | Electric motor assembly including permanent magnet assembly |
WO1996038900A1 (en) * | 1995-06-02 | 1996-12-05 | Ugimag S.A. | Device for attaching magnets to electric motor stator or rotor yokes |
EP0782238A1 (en) | 1995-12-27 | 1997-07-02 | Valeo Systemes D'essuyage | Permanent magnet motor with blocking klips |
DE102006022612A1 (en) * | 2006-05-15 | 2007-11-22 | Schürholz GmbH & Co. KG Stanztechnik | Housing element e.g. rotor pot, for e.g. electronic commutating motor, has spring element with radial guide placed at end, where guide protrudes from base to interference body and engages in recess of interference body in suitable manner |
DE102006022612B4 (en) * | 2006-05-15 | 2010-06-02 | Schürholz GmbH & Co. KG Stanztechnik | Housing element for an electrical machine, method for its production and electric external rotor motor |
EP2149962A3 (en) * | 2008-08-01 | 2012-03-21 | Denso Corporation | A magneto field type motor and a method of manufacturing it |
Also Published As
Publication number | Publication date |
---|---|
CA1247686A (en) | 1988-12-28 |
DE3570962D1 (en) | 1989-07-13 |
US4745319A (en) | 1988-05-17 |
EP0154335A3 (en) | 1986-07-16 |
EP0154335B1 (en) | 1989-06-07 |
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